package com.bj.zspace.cloud.gateway.filter;

import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.filter.GatewayFilter;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.factory.AbstractNameValueGatewayFilterFactory;
import org.springframework.http.HttpHeaders;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Slf4j
@Component
public class OnceTokenGatewayFilterFactory extends AbstractNameValueGatewayFilterFactory {
    @Override
    public GatewayFilter apply(NameValueConfig config) {
        return new GatewayFilter() {
            @Override
            public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
                // 每次响应之前添加一次性令牌
                log.info("OnceTokenGatewayFilterFactory invoked");
                return chain.filter(exchange).then(Mono.fromRunnable(() -> {
                    ServerHttpResponse response = exchange.getResponse();
                    HttpHeaders headers = response.getHeaders();
                    headers.add(config.getName(), config.getValue());
                }));
            }
        };
    }
}
